diff -u b/core/modules/file/src/Element/ManagedFile.php b/core/modules/file/src/Element/ManagedFile.php
--- b/core/modules/file/src/Element/ManagedFile.php
+++ b/core/modules/file/src/Element/ManagedFile.php
@@ -353,16 +353,13 @@
     // with it.
     $element['#id'] = &$element['upload']['#id'];
 
-    // Add states to ajax wrapper to states.js can potentially attach this
+    // Add states to ajax wrapper so states.js can potentially attach this
     // element as a Dependent.
     $attributes = '';
     if (isset($element['#states']) && !empty($element['#states'])) {
-      $attribute = new Attribute([
+      $attributes = new Attribute([
         'data-drupal-states' => json_encode($element['#states']),
       ]);
-
-      // Add a preceeding space.
-      $attributes = ' ' . $attribute;
     }
 
     // Prefix and suffix used for Ajax replacement.